ymd_hms {lubridate} | R Documentation |
Transform dates stored as character or numeric vectors to POSIXct
objects. ymd_hms family of functions recognize all non-alphanumeric
separators (with the exception of "." if frac = TRUE
) and correctly
handle heterogeneous date-time representations. For more flexibility in
treatment of heterogeneous formats, see low level parser
parse_date_time
.
ymd_hms(..., quiet = FALSE, tz = "UTC", locale = Sys.getlocale("LC_TIME"), truncated = 0)
... |
a character vector of dates in year, month, day, hour, minute, second format |
quiet |
logical. When TRUE function evalueates without displaying customary messages. |
tz |
a character string that specifies which time zone to parse the date with. The string must be a time zone that is recognized by the user's OS. |
locale |
locale to be used, see locales. On linux systems you
can use |
truncated |
integer, indicating how many formats can be missing. See details. |
ymd_hms() functions automatically assigns the Universal Coordinated Time
Zone (UTC) to the parsed date. This time zone can be changed with
force_tz
.
The most common type of irregularity in date-time data is the truncation
due to rounding or unavailability of the time stamp. If truncated
parameter is non-zero ymd_hms
functions also check for truncated
formats. For example ymd_hms
with truncated = 3
will also parse
incomplete dates like 2012-06-01 12:23
, 2012-06-01 12
and
2012-06-01
. NOTE: ymd
family of functions are based on
strptime
which currently fails to parse %y-%m
formats.
As of version 1.3.0, lubridate's parse functions no longer return a
message that displays which format they used to parse their input. You can
change this by setting the lubridate.verbose
option to true with
options(lubridate.verbose = TRUE)
.
a vector of POSIXct date-time objects
ymd
, hms
. parse_date_time
for underlying mechanism.
x <- c("2010-04-14-04-35-59", "2010-04-01-12-00-00") ymd_hms(x) # [1] "2010-04-14 04:35:59 UTC" "2010-04-01 12:00:00 UTC" x <- c("2011-12-31 12:59:59", "2010-01-01 12:00:00") ymd_hms(x) # [1] "2011-12-31 12:59:59 UTC" "2010-01-01 12:00:00 UTC" ## ** heterogenuous formats ** x <- c(20100101120101, "2009-01-02 12-01-02", "2009.01.03 12:01:03", "2009-1-4 12-1-4", "2009-1, 5 12:1, 5", "200901-08 1201-08", "2009 arbitrary 1 non-decimal 6 chars 12 in between 1 !!! 6", "OR collapsed formats: 20090107 120107 (as long as prefixed with zeros)", "Automatic wday, Thu, detection, 10-01-10 10:01:10 and p format: AM", "Created on 10-01-11 at 10:01:11 PM") ymd_hms(x) ## ** fractional seconds ** op <- options(digits.secs=3) dmy_hms("20/2/06 11:16:16.683") ## "2006-02-20 11:16:16.683 UTC" options(op) ## ** different formats for ISO8601 timezone offset ** ymd_hms(c("2013-01-24 19:39:07.880-0600", "2013-01-24 19:39:07.880", "2013-01-24 19:39:07.880-06:00", "2013-01-24 19:39:07.880-06", "2013-01-24 19:39:07.880Z")) ## ** internationalization ** ## Not run: x_RO <- "Ma 2012 august 14 11:28:30 " ymd_hms(x_RO, locale = "ro_RO.utf8") ## End(Not run) ## ** truncated time-dates ** x <- c("2011-12-31 12:59:59", "2010-01-01 12:11", "2010-01-01 12", "2010-01-01") ymd_hms(x, truncated = 3) ## [1] "2011-12-31 12:59:59 UTC" "2010-01-01 12:11:00 UTC" ## [3] "2010-01-01 12:00:00 UTC" "2010-01-01 00:00:00 UTC" x <- c("2011-12-31 12:59", "2010-01-01 12", "2010-01-01") ymd_hm(x, truncated = 2) ## [1] "2011-12-31 12:59:00 UTC" "2010-01-01 12:00:00 UTC" ## [3] "2010-01-01 00:00:00 UTC" ## ** What lubridate might not handle ** ## Extremely weird cases when one of the separators is "" and some of the ## formats are not in double digits might not be parsed correctly: ## Not run: ymd_hm("20100201 07-01", "20100201 07-1", "20100201 7-01") ## End(Not run) ## "2010-02-01 07:01:00 UTC" "2010-02-01 07:01:00 UTC" NA